In the world of love letters, those to sweethearts of time past are something exceptional, emotionally generous and one of life’s great gifts. Even if you do not stay together for a lifetime as sweethearts, the qualities you loved are still there, so why not take a pen to paper and pay tribute to what you loved and always will. Laura Athuil, interior designer turned pastry chef (yes, her creme puffs will be coming soon) has recently moved to San Francisco from Paris. She knows something important about what remains of love even across time and distance. To hear her talk about what remains of love is a joy